Difference Between Ascending and Descending Paper Chromatography

Thekey differencebetween ascending and descending paper chromatography is thatascending paper chromatography involves the movement of the溶剂一个向上的方向而降纸chromatography involves the movement of the solvent in a downward direction.

Paper chromatography is a type of chromatographic technique in which the components in the analyte mixture are distributed and partitioned between liquid phases. Generally, paper chromatography uses water as one liquid phase; water that is held in the pore of the filter paper used for the analysis is the固定阶段while a移动阶段moves through this stationary phase.

内容

1.Overview and Key Difference
2.什么是色谱
3.What is Ascending Paper Chromatography
4.What is Descending Paper Chromatography
5.Side by Side Comparison – Ascending vs Descending Paper Chromatography in Tabular Form
6.概括

什么是色谱?

Chromatography is a type of analytical technique used to separate and determine the components in a mixture. During this analysis, we need to dissolve the analyte mixture in a fluid. This fluid is called the mobile phase because it acts as the medium that carries the analyte components through another material called the stationary phase. Various components in the mixture then travel through the stationary phase at different speeds, causing the separation of the components. Chromatography can be used for the analysis of both organic and inorganic component mixtures.

What is Ascending Paper Chromatography?

上升纸色谱法是一种分析技术，在该技术中，流动相在固定相中向上移动。我们可以称这种情况为“色谱图上升”。为了观察溶剂向上方向的运动，溶剂储层应位于我们用于分析的容器的底部。

In this technique, the chromatographic paper with the tip having sample spots is dipped into the solvent at the bottom, so the spots remain well above the solvent. After some time, we can observe the solvent, along with the contents of the analyte mixture, is travelling upward the chromatographic paper. After the solvent front has reached the end of the paper, we can take out the paper from the solvent to determine the relative rates of each constituent in the analyte mixture that has travelled through the paper over a particular time period.

什么是下降纸色谱？

Descending paper chromatography is an analytical technique in which the mobile phase moves downward through the stationary phase. In other words, in this method, the development of the paper occurs due to the movement of the solvent downwards on the paper. Therefore, the solvent reservoir should be at the top of the paper. In this process, the movement of the solvent is governed by gravity as well as capillary action.

What is the Difference Between Ascending and Descending Paper Chromatography?

Ascending and descending paper chromatography are two types of chromatographic techniques. The key difference between ascending and descending paper chromatography is that ascending paper chromatography involves the movement of the solvent in the upward direction whereas descending paper chromatography involves the movement of the solvent in the downward direction.

Moreover, in ascending paper chromatography, movement occurs due to capillary action while in descending paper chromatography, movement occurs due to capillary action and gravity.

Below infographic tabulates the differences between ascending and descending paper chromatography.